I had not felt his remorse over Mom's death, understood his intense loneliness as an "empty nester, " or realized most of his pals had long since light-beamed off the planet.

我并没有体会到母亲去世时他的扼腕之情，也没有理解他作为”空巢老人“强烈的孤独感，更没有意识到他许多朋友已经驾鹤西去。